#### • Class 11 Physics Demo

Explore Related Concepts

#### • biology worksheet

Question:tan x + sec x = 2 cos x solve for x (without a calculator) altho u guys can use a calculator, just the worksheet says not to i dont need a number, just the simplified form of the equation. thnx

Answers:tan x = sinx/cosx and sec x = 1/cosx so it becomes (sin x + 1)/cosx = 2 cosx. Cross multiply to get 2 cos^2 x = sinx + 1 Replace cos^2 x with its equivalent, 1 - sin^2 x to get 2(1 - sin^2 x) = sinx + 1. Distribute: 2 - 2 sin^2 x = sinx + 1. Move stuff from left to right: 0 = 2 sin^2 x + sinx - 1. Factor: 0 = (2 sinx - 1)(sin x + 1) So sin x = 1/2 or sin x = -1. Find where this happens and you have it.

Question:For Physics we have to do a trigonometry worksheet. I know how to do all of the problems except one. The triangle looks like this, http://i27.tinypic.com/uy71e.jpg we have to solve for, x, y and Q the triangle a right, 90 degree triangle. please help. thanks :)

Answers:I think you are missing something